Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 interchange used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. yet had issues. back to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune subsequently this car.. bought a used one.. more trouble. had the original one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every period I take it reach the dealer for diagnostics.. on going problems are really tallying up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts going on and runs at 1750 and within a minute or hence climbs exceeding 2500.. It is doling out smooth though, just way progressive than it should be. I in addition to checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every connections verified. I feel good roughly them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF related it is by yourself measuring the freshen that is getting behind the MAF, so if the intake manifold is sucking in let breathe the air to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner spray vaporizer in the place of the hissing subsequently the engine direction and subsequently you hear the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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